| 摘要 |
PURPOSE:To simplify the detection of bearing of a car by detecting numerical values relating to magnetic vectors due to the magnetization of a car at the one rotation of the car and, when the values exceed prescribed values, alarming the fact to its driver and automatically compensating an error due to the magnetization of the car. CONSTITUTION:Voltages relating to the horizontal component of force of a terrestrial magnetism sensor 1 and an angle formed by the horizontal component and a secondary coil 13 on the X side are generated in a secondary coil 12 on the Y side and the coil 13, respectively. Only bearing signal components obtained by passing these voltages through band pass filters 21, 22 are selected and amplified and the amplified signals are moreover amplified by DC amplifiers 23, 24 up to the processing level of A/D converters 25, 26. When magnetic vectors due to car magnetization exceed prescribed values at the rotation of the car, a microcomputer 31 outputs an alarm signal to a display circuit 32 to perform the alarm display. Subsequently current proportional to an error is made to flow from the computer 31 to the Y side secondary coil 12 and the X side secondary coil 13 through D/A converters 27, 28 and voltage/current converting circuits 29, 30, respectively. |
